Calcium By Jack yekel and Lauren korczakowski

Name: Calcium
Symbol: Ca
Atomic Number: 20
Atomic Mass: 40.078 amu
Melting Point: 839.0 °C (1112.15 K, 1542.2 °F)
Boiling Point: 1484.0 °C (1757.15 K, 2703.2 °F) g
Number of Protons/Electrons: 20
Number of Neutrons: 20
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 1.55 g/cm3
Color: Silvery


Discovered: 1808

Discoverer: Sir Humphrey Davy

Origin of Name: From the latin word calcis (lime)

Uses: life forms for bones and shells

Obtained From: chalk, limestone, marble. 3.5% of crust

Abundance: 5th most abundant element in the Earth's crust.

4.15×104 milligrams per kilogram

Form: In room temperature it is found as a metal.

Compounds apart of: slaked lime (Ca(OH)2)

Calcium carbonate (CaCO3)-
Calcium carbonate is used to make white paint, cleaning powder, toothpaste and stomach antacids, among other things.

Most Common Isotope- Ca-40

Elements that react with calcium:

fluorine, chlorine, bromine, iodine, and astatine- (halogens)

Calcium is used not only in the body, but in lime stone as well. Calcium ions are found in Ca supplements (pills) to strengthen bones in the body.
In addition, lime is calcium carbonate. Without Ca, bones would be weaker and lime would not exist.

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Sources:

crhttp://www.chemicalelements.com/elements/ca.html
http://en.wikipedia.org/wiki/Isotopes_of_calcium